.nav {
  position: relative;
  width: auto;
  display: inline-block;
  border: none;
}


.btn-nav {
  position: fixed;
  top: 50px;
  right: 30px;
  background: transparent;
  border: none;
  padding: 10px;
  -webkit-transition: all .5s ease;
  -moz-transition: all .5s ease;
  -ms-transition: all .5s ease;
  -o-transition: all .5s ease;
  transition: all .5s ease;
  cursor: pointer;
  z-index: 99999;
}

.btn-nav:focus {
  outline: 0;
}

.icon-bar {
  display: block;
  margin: 6px 0;
  width: 40px;
  height: 5px;
  background-color: #FFFFFF;
}

.btn-nav:hover .icon-bar {
  -webkit-transition: all 1s ease;
  -moz-transition: all 1s ease;
  -ms-transition: all 1s ease;
  -o-transition: all 1s ease;
  transition: all 1s ease;
  background-color: #ffef40;
}

.nav-content {
  position: fixed;
  top: -100%;
  bottom: 0;
  left: 0;
  right: 0;
  /*background: #000000;*/
  background-image: url(http://zengtongxue.oss-cn-chengdu.aliyuncs.com/images/ocean.jpg);
  display: block;
  height: 100%;
  z-index: 9;
}

.nav-list {
  list-style: none;
  padding: 0;
  position: relative;
  top: 30%;
}

.item-anchor:after {
  content: "";
  position: absolute;
  width: 3px;
  height: 3px;
  left: 0;
  bottom: 0;
  z-index: 9;
  background: transparent;
  -webkit-transition: all 1s ease;
  -moz-transition: all 1s ease;
  -ms-transition: all 1s ease;
  -o-transition: all 1s ease;
  transition: all 1s ease;
}

.item-anchor {
  color: #fff;
  font-size: 30px;
  text-transform: uppercase;
  position: relative;
  text-decoration: none;
  padding: 10px;
}

.item-anchor:hover,
.item-anchor:focus {
  color: #ffef40;
  -webkit-transition: all 1s ease;
  -moz-transition: all 1s ease;
  -ms-transition: all 1s ease;
  -o-transition: all 1s ease;
  transition: all 1s ease;
}

.item-anchor:hover:after,
.item-anchor:focus:after{
  width: 100%;
  background: #ffef40;
  -webkit-transition: all 1s ease;
  -moz-transition: all 1s ease;
  -ms-transition: all 1s ease;
  -o-transition: all 1s ease;
  transition: all 1s ease;
}

.nav-item {
  margin: 40px auto;
  text-align: center;
}

.animated {
  display: block;
  margin: 0 auto;
}

.animated:hover .icon-bar,
.animated:focus .icon-bar{
  background-color: #ffef40;
}

.animated:focus {
  cursor: pointer;
  z-index: 9999;
}

.middle {
  margin: 0 auto;
}

.icon-bar {
  -webkit-transition: all .7s ease;
  -moz-transition: all .7s ease;
  -ms-transition: all .7s ease;
  -o-transition: all .7s ease;
  transition: all .7s ease;
  z-index: 999999;
}

.animated .icon-bar {
  z-index: 999999;
  background-color: #ffef40;
}

.animated .top {
  -webkit-transform: translateY(10px) rotateZ(45deg);
  -moz-transform: translateY(10px) rotateZ(45deg);
  -ms-transform: translateY(10px) rotateZ(45deg);
  -o-transform: translateY(10px) rotateZ(45deg);
  transform: translateY(10px) rotateZ(45deg);
}

.animated .bottom {
  -webkit-transform: translateY(-11px) rotateZ(-45deg);
  -moz-transform: translateY(-11px) rotateZ(-45deg);
  -ms-transform: translateY(-11px) rotateZ(-45deg);
  -o-transform: translateY(-11px) rotateZ(-45deg);
  transform: translateY(-11px) rotateZ(-45deg);
}

.animated .middle {
  width: 0;
}

@keyframes showNav {
  from {
    top: -100%;
  }
  to {
    top: 0;
  }
}

@-webkit-keyframes showNav {
  from {
    top: -100%;
  }
  to {
    top: 0;
  }
}

@-moz-keyframes showNav {
  from {
    top: -100%;
  }
  to {
    top: 0;
  }
}

@-o-keyframes showNav {
  from {
    top: -100%;
  }
  to {
    top: 0;
  }
}

.showNav {
  -webkit-animation: showNav 1s ease forwards;
  -moz-animation: showNav 1s ease forwards;
  -o-animation: showNav 1s ease forwards;
  animation: showNav 1s ease forwards;
}

@keyframes hideNav {
  from {
    top: 0;
  }
  to {
    top: -100%;
  }
}

@-webkit-keyframes hideNav {
  from {
    top: 0;
  }
  to {
    top: -100%;
  }
}

@-moz-keyframes hideNav {
  from {
    top: 0;
  }
  to {
    top: -100%;
  }
}

@-o-keyframes hideNav {
  from {
    top: 0;
  }
  to {
    top: -100%;
  }
}

.hideNav {
  -webkit-animation: hideNav 1s ease forwards;
  -moz-animation: hideNav 1s ease forwards;
  -o-animation: hideNav 1s ease forwards;
  animation: hideNav 1s ease forwards;
}

.hidden {
  display: none;
}

li.nav-item{
  float: none;
  margin: 40px;
  text-align: left;
}
